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Commit 78098117 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add support for generating stream reconf add incoming/outgoing streams request chunk 



This patch is to define Add Incoming/Outgoing Streams Request
Parameter described in rfc6525 section 4.5 and 4.6. They can
be in one same chunk trunk as rfc6525 section 3.1-7 describes,
so make them in one function.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a92ce1a4

include/linux/sctp.h

+7 −0
Original line number Diff line number Diff line
@@ -742,4 +742,11 @@ struct sctp_strreset_tsnreq { 
	__u32 request_seq;

};



struct sctp_strreset_addstrm {

	sctp_paramhdr_t param_hdr;

	__u32 request_seq;

	__u16 number_of_streams;

	__u16 reserved;

};



#endif /* __LINUX_SCTP_H__ */

include/net/sctp/sm.h

+3 −0
Original line number Diff line number Diff line
@@ -267,6 +267,9 @@ struct sctp_chunk *sctp_make_strreset_req( 
				bool out, bool in);

struct sctp_chunk *sctp_make_strreset_tsnreq(

				const struct sctp_association *asoc);

struct sctp_chunk *sctp_make_strreset_addstrm(

				const struct sctp_association *asoc,

				__u16 out, __u16 in);

void sctp_chunk_assign_tsn(struct sctp_chunk *);

void sctp_chunk_assign_ssn(struct sctp_chunk *);

net/sctp/sm_make_chunk.c

+46 −0
Original line number Diff line number Diff line
@@ -3687,3 +3687,49 @@ struct sctp_chunk *sctp_make_strreset_tsnreq( 


	return retval;

}



/* RE-CONFIG 4.5/4.6 (ADD STREAM)

 *   0                   1                   2                   3

 *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 *  |     Parameter Type = 17       |      Parameter Length = 12    |

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 *  |          Re-configuration Request Sequence Number             |

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 *  |      Number of new streams    |         Reserved              |

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 */

struct sctp_chunk *sctp_make_strreset_addstrm(

				const struct sctp_association *asoc,

				__u16 out, __u16 in)

{

	struct sctp_strreset_addstrm addstrm;

	__u16 size = sizeof(addstrm);

	struct sctp_chunk *retval;



	retval = sctp_make_reconf(asoc, (!!out + !!in) * size);

	if (!retval)

		return NULL;



	if (out) {

		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS;

		addstrm.param_hdr.length = htons(size);

		addstrm.number_of_streams = htons(out);

		addstrm.request_seq = htonl(asoc->strreset_outseq);

		addstrm.reserved = 0;



		sctp_addto_chunk(retval, size, &addstrm);

	}



	if (in) {

		addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS;

		addstrm.param_hdr.length = htons(size);

		addstrm.number_of_streams = htons(in);

		addstrm.request_seq = htonl(asoc->strreset_outseq + !!out);

		addstrm.reserved = 0;



		sctp_addto_chunk(retval, size, &addstrm);

	}



	return retval;

}